Portion of a shoe



FIG. 1 is a top plan view of a portion of a shoe showing our new design;

FIG. 2 is a bottom view thereof; and,

FIG. 3 is a right side view thereof.

The broken lines, showing the remainder of a shoe in the Figures, show environment for illustrative purposes only and form no part of the claimed design. The dot-dashed lines in the Figures show an indeterminate border around portions of the subject matter being claimed. 

The ornamental design for a portion of a shoe, as shown and described. 